I was considering using Polymer. It worked great in Chrome. Then I tried using it in Firefox. It took a whole extra 1 second longer for Polymer to bootstrap

I was considering using Polymer. It worked great in Chrome. Then I tried using it in Firefox. It took a whole extra 1 second longer for Polymer to bootstrap itself on every page load, even when all assets were cached. The blog post mentions speedups in Chrome and Safari. It does not mention Firefox.